USING SIGNAL TAP TO MONOTOR AVALON_BUS WITH NIOS DESIGN

hii 

i need to use signal tap to see what's happening on avalon bus , i have a qsys system that is working fine , its the remote update example , and when i add  a signal tap file and add for example the avalon bus signals the connects to the on chip flash ip , and i try to write the cfm0 the signal tap does not work . i put the trigger on a rising edge of a avalon_write and nothing seems to happen , i be glad for help :)